Tack machine



Oct. 6, 1925. 1,555,933

y G. B. BAKER ET AL TACK MACHINE Filed Aug. 8. 1923 3 Sheets-Sheet lr1 OCL 6, 1925. 1,555,933

G. B. BAKER ET AL TACK MACHINE Filed Aug. a, 192s 5 sh'eets-sheet 2 lzwenzmrs,

G. B. BAKER ET Ai.

@am 6, 1925a TACK MACHINE Fild Aug. s, 1925 3 Sheets-Sheet von..

Patented Oct 6, 1.925.

yUNITI-:n STATES PATENT OFFICE.

GEORGE R. BAKER, HERBERT E. BAKER, AND EDWARD c. BAKER, or RRocKToN,

v MAssAcKpsETTs.

TAcK MACHINE Application led August 8, 1923. Serial- No. 656,411.

To all whom t may concern.'

`Be it known that we, GEORGE B. BAKER, HERBERT B. BAKER, and EDWARD C. BAKER, citizens of the United States of America, and residents of Brockton, in the county of Plymouth and State of Massachusetts, have invented new and useful Improvements in Tack Machines, of which the following is a specification.

This invention pertains to tack and nail making machines and relates more particularly to means for feeding the blanks or tack strips to the cutting' instrumentalities.

In our co-pending application, Serial No. 646,846, filed June 21, 1923, we have disclosed mechanism of a semi-automatic type applicable to existing tack and nail machines of usual design and operating automatically to present a fresh blank or tack strip to the cutting instrumentalities when the old strips are consumed.

Principal objects of the present invention are to provide more positive means for feeding the blanks towardy the cutting instrumentalities; to provide an improved automatic mechanism for initiating the feeding of a fresh blank; to provide improved blank presenting means; and in general to simplify the construction of the feed mechanism and t make its operation certain.

A preferred embodiment of the invention is illustrated by way of example in the laccompanying drawings, in which:

Fig. 1 is a side elevation of a tack machine of well known known type having the present improvements applied thereto;

Fig. 2 is a fragmentary side elevation partly in section and to larger'scale showing details of the blank feeding and presenting devices;

Fig. 3 is a planview, partly in section,

'of the parts shown in Fig. 2.;

Fig. 4 is a longitudinal vertical section of the parts'shown in Fig. 2;

Fig. 5 is a vertical section substantially on the line 5--5 of Fig. 4;

Fig. 6 is a vertical section on the line 6-6 of Fig. 4;

F ig. 7 is a vertical section on the line 7-7 of F 1g. 4;

Fig. 8 is a fragmentary side elevation illustrating details of "construction of the blank feeding devices viewedfrom the side opposite to that from which Fig. 2 is taken;

Fig. 9lis`-`a fragmentary plan view partly showing nism; and

Fig. 14 is a fragmentary side elevation to large scale showing details of a blank clamping device.

Referring to the drawings, 1 indicates the supporting frame of a tack machine of usual construction. This frame is provided with bearings for a main shaft having a hand wheel 2 and also sup orts an anvil block 3 comprising the fixe the latter being provided with a diagonal cutting edge in the usual manner. The main shaftv is furnished with the usual cams, cranks, and other devices for actuating the operative parts of the machine including the movable cutters 5 and 6 and the movable gage 7.

Resilient guards 8 and 9 are supported upon the anvil block. 3 in suitable brackets 10 and 11 respectivelv as is usual in machines of this character, the guards cooperating with the blank to position it properly for the action of the cutters. A table 12 projects from the upper part of the frame and is provided with a relatively narrow elongate extension 13.

The usual cylindrical tubular blank presenting barrel 14 is employed for guiding the blank strips toward the cutters. This barrel inclines downwardly toward the anvil and is furnished adjacent to its upper end with a spherical collar 15 which turns freely in a cup bearing 16 carried by a bracket 17 mounted on the extension member 13.

At a suitable point intermediate 'the bracket 17 and the anvilblock, posts 18 and 19 are secured in a forwardly and upwardly extending arm 20 carried by a block 21 sea modied form of feed mecha-- or ledger blade 4,

cured to the table 12. A cross bar 2 2 is secured to the upperends of the posts 18 and 19 by means o bolts 23. Preferably this bar is provided with tins '24 which engage suitable slots in the upper ends of the posts to maintain the posts in exact parallelism. The `under surface of the bar 22 is furnished with a depending lug for positioning a coil spring 26 interposed between the bar 22 and a yoke 27 guided b the posts 18 and 19to slide vertically an having a concave lower surface which rests upon the top of the barrel 14. This spring pressed yoke tends to hold the barrel downwardly with its free lower extremity engaging the upper surface of the anvil block but permits the barrel to rise slightly as it is oscillated during the operation of the machine. By removing the bolts 23 the bar 22 may be raised, thus permitting the barrel to be lifted from between posts 18 and 19 and swung to one side away from the cutting instrumentalities to permit sharpening or adjustment of the latter.

Straps 28 and 29 are employed for oscillating the barrel as is usual in machines of this type. These straps are wound in opposite directions about the barrel and their `lower ends are secured to oppositely extending arms of a lever 30 fulcrumed at 31 upon the extension 13. This lever is rocked by means of a link 32 actuated from the main shaft of the machine and provided with a normally fixed block 33 having a notch for the reception of a stud or pin 34 projecting from a depending arm of the lever 30. The stud 34 is normally held in engagement with the block 33 by the arm 35 ofa counterweighted lever 36 .carried by an adjustable block 37 mounted on the link 32. 0

A yoke 38 carrying a forwardly extending guideway 39 is pivotally secured to the bracket 17. This yoke has the depending lug 38a bearing'against an adjustable set screw 40 which permits the yoke with its guide member 39 to be adjusted angularly. The guide member 39 is normally dlsposed parallel to the axis of the barrel 14 and 1s ,furnished with a suitable slot or track along which a block 41 may slide. This block is preferably provided with a handle 41u and with a transverse bore in which a short shaft 42 is journaled. The axis of the shaft normally aligns with that of the barrel and the lower endA of the shaft is provided with a projection 42 constituting a fixed jaw wlth which a resilient jaw 43 cooperates. jaw 43 preferably lconsists ofa flat spring secured at one end to the shaft'. The clam comprising the jaws 44 and 43 is adapte to grip the upper end of a Areserve blan whose lower end is disposed j ust within the upper end of theibarrel 14. Ordinarily the central part of the blank needs no support. A flexible cord or chain 45 is connected at. one end to the block 41 and extends down'-y wardly along theI guideway 39 to the pulley 46, and thence down and under the pulley 47 supporting the weight 48, the opposite end 49 yof the cord or chain being attached to a convenient part of the extension 13. The block 41 is normally held at the upper The end of the guide member 39 by means of alatch 50 which engages the upper end of the vertically movable core of a solenoid 51, the arrangement being such that upon energization of the coils of the solenoid the core is retracted and the latch 50 is released to permit the weight 48 to pull the block 41 down the guideway 39.. Any other suitable type of electrically releasable latch mechanism may be substituted for that herein shown.

The barrel is furnished at its lower end with an extension comprising the sleeve member 52 having a peripheral rib 53 having opposed conical sockets for the reception of the conical ends of pivot pins 54 an 55 respectively. These pivot pins have threaded engagement with diametrically opposite radial openings in a flat ring 5 6 nor-` mally concentric with the sleevev and constituting a lever capable of rocking relatively to the sleeve. Cams 57 and 58 are disposed upon opposite sides respectively of the ring 56, one of the cams as for -example the lcam 57 being adjustably mounted upon the ring by neans of a pin 59 entering a slot 60 in the ring. The cams 57 and 58 are preferably disposed substantially 90 away from the axis of oscillation of the ring and diametrically opposite to one another. At a point adjacent to one of the cams the peripheral portion of the ring is cut away to provide a shoulder 61 substantially per-` pendicular to the axis of oscillation of the ring, its purpose' being described hereinafter. At its lower end the sleeve 52 merges into a box-like casing 62 which is open at "to and bottom and which'has openings 63 an 64 aligning with the barrel 14. Pins 65 an from opposite'walls of the casing 62 an into the opening 63. The inner ends of these pins are beveled to provide a converging guide passage for properly blank or nail strip as it enters casing.

A shaft 67 is journaled in fixed bearing openin s in the side wal-ls of the box 62 and 66 project inwardly the 'box or -is yprovided at its central part with a'roller comprising spaced discs 68 whose peripheral surfaces are preferably knurledj. second shaft 69 parallel tothe shaft/ 67 is arranged lto turn in vertically elongatel bearing openings in `the side Walls of box or casing 62. This comprising a pair of spaced knurled discs 70 which coo erate with the discs 68 in feeding a blan strip.

A yoke 71 extends transversely' across the bbx above the sha-ft 69 and is profvided with depending legs notched at their lower ends to engage the shaft 69. The yoke 71 is provided with the upwardly projecting pin 72 at its central part 4which passes through an ening in a contact supporting lever 74 o w ose rear extremity is seated loosely in an assage through the directing the.

dao

shaft also carries a roller a opening in a bracket 7 3 secured to the casing 62. The top of the casing is provided with a cover 76 having legs 77 which rest upon the upper edge of the casing and which is secured to the latter by screws 76". This cover is furnished with a cavity for the reception of a spring 78 vwhich bears upon the upper surface of the lever 7 4 and whose tension may be adjusted by means of a set screw 79.

The forward free extremity of the lever 74 is provided with an ladjustable contactpin' 8O engageable with a metallic ring 80tt surrounding the sleeve 52 and insulated therefrom by suitable insulating material 81. A metallic conductor J82 extends forwardly along the sleeve 52 from the ring 8Oa and through a slot in the rib 53 and is connecte'd to an annular plate or washer 83 secured to the end of the sleeve 52. The conductor 82 and the washer 83 are insulated from the sleeve52 as indicated at 84.

A resilient contact finger 86 bears at all times against the outer surface of the washer 83. This finger is secured to the bracket 20 but is insulated therefrom and a conductor wire 87 leads from the .finger 86 to one terminal of the solenoid 51. A battery 88, or other suitable source of electrical energy may be interposed at a desired point in the conductor 87. A second conductor 89 is grounded upon the frame of the machine at a suitable point and extends to the other terminal of the solenoid 51.

The upper part of the block 21 is furnished with an undercut or dove-tail slot 90 for the reception of the heads of bolts 91 and 92. These bolts are locked in adjusted position by means of nuts 93 bearing upon the upper surface ofthe block 21. Antifriction rollers 94 and 95 are mounted to turn upon the upper projecting ends of the bolts 91 and 92 respectively, being held in position thereon by short bolts 96. The rollers 94 and 95 are so disposed that they lie on opposite sides of the plane of the ring 56 and are thus adapted for engagement by the cams 58 and 57 respectively.

One end of a link 97 is pivotally secured at 98 to the shoulder 61 of the ring 56 and its opposite end is pivotally connected by a bolt 99 to the free extremity of a lever 100 journaled to turn freely upon one end of the shaft 67 which projects outwardly through the wall of the casing 62. A ratchet wheel 101 isalso mounted upon the projecting end of the shaft 67 but is fixed to the latter. Pawl 102 is pivotally secured by means of a bolt 102a to the lever 100 and is normally kept in engagement with the teeth of the ratchet wheel 101 by a coil spring 103 attached at one end to the pawl and at the other-to a pin 104 projecting from the sleeve 102.

The lower part of the casing or box 62 projects rearwardly to provide a 'supporting bracket 105 upon which the lower plate 106 of a nose piece is mounted. This nose piece also includes the upper plate 107 and the spacer members 108 and 109 which hold the plates 106 and 107l in vertically spaced position. The plates 106 and 107 and the spacers 108 and 109 are held in assembled relation by means of bolts 110 and 111, certain of these bolts entering threaded openings in the bracket 105 to secure the nose piece to the box 62. Preferably the plates 106 and 107 have forwardly projecting tongues 106a and 107a respectively which extend into the grooves between the discs forming the upper and lower feed rolls.

As indicated in Figs. 11 and 12 the spacer members 108 and 109 may be of different Widths or thicknesses to provide a blank guiding channel of any desired cross sectional form. To permit the feeding mechanism to handle blanks of different widths or thicknesses it is contemplated that the machine will be provided with a plurality of interchangeable sets of such spacer members bymeans of which the guide channel may be adapted to the particular size of blank which it is desired to feed.

In Fig. 13 a modified form of drive mechanism for the feed rollers is illustrated. In this figure the barrel proper is indicated at 14a, the sleeve at 52a, and the casing or box at-62a. The casing is provided with feed rollers (not shown) the lowermost of which has a projecting shaft 67a furnished with a ratchet wheel 101B. The lever 100a is pivoted uponthe shaft 67a and is provided with the pivoted pawl 102a engaging the ratchet wheel. A spring 103a normally` holds the pawl in operative relation to the wheel. The lever 100a is furnished with a lug 114'whicl1 contacts with the end of the slide bar 114 mounted' in suitable guidefbrackets 116 carried by thev box. The opposite end of the bar 115 is so disposed as to contact with either of a pair of cams 117 mounted upon the posts 18 and 19` respectively.

The operation of themachine is substantially as follows, it being assumed that the parts initially occupy the position shown in Fig. 1 andthat the main shaft is rotating and that the barrel 14 is oscillating.

As indicated in Fig. 4 a; blank or tack strip 113 is passing between the feed rollers comprising the discs 68 and 70 and between the guiding tongues 106 and 107a into the channel in the nose piece which rests upon the upper surface of the anvil. The end of the tack strip projects beyond the. end of the nose piece and at each stroke of the cutters the projecting portion of the strip is cut olf to form a tack all in the usual manner. The presence of the blank between the feed rollers causes the upper roll to be lifted in opposition tothe spring 78 so that the contact pin is normally held away from the ring 80a. The ring 56 oscillates with the barrel and thus the cams 57 and 58 are brought alternately into 'contact with the rollers and 94 respectively. At each such contact Ithe ring 56 is so rocked `as to swing the lever with its pawl to move the ratchet wheel 101 a step forward. The shaft 67 is thus intermittently driven and as this shaft is connected tothe upper shaft l69 by means of intermeshing gears 206 the upper shaft is also positively driven. During the intervals between contacts of the-cams 57 and 58 with their rollers spring 103.1'etracts the lever 101 to cause the pawl 102 to engage an advanced tooth of the ratchet. The feed rollers thus feed the tack stripforward intermittently and at substantially the rate at which it is consumed.

The feeding of the blank or tack strip thus continues until the end of thel strip passes from beneath the upper roller 70 lwhen the latter immediately drops under the action of the spring 78. This causes the contact pin 80 to engage the ring 80a completmg the circuit through the solenoid and releasing the latch 50. The block 41 is immediately pulled down the guideway 39 by the weight 48 andas the upper end of the fresh or replenishing tack strip or blank 44 'is held betweenr the jaws 42 and 43 the fresh strip is fed quickly down into the barrel until its lower end enters between the rotating rollers 68 and 70. As soonas the rollers grip the strip they begin to feed it forward and the upper roll is thus forced upwardly to its normal position breaking the circuit through the solenoid. The descent of the block 41 is readily observed by the operator by reason of the prominence of the upstanding handle 41a and as soon as convenient the operator pulls the block 41 back to its normal position where it is automatically latched. The operator then inserts the end of the fresh tackstrip into the upper end of the barrel 14, forces its opposite end between the jaws 42 and 43, and `the machine is ready for the repetition of the above sequence of operation.

The device shown in Fig. 13 operates in substantially the same manner as that previously described except that in this case the rocking ring or lever 56 is'dispensed with and the actuating cams are fixed. As the barrel oscillates the end of the pin 15 engages one of the cams 117 and then the other so that the lever 100a is intermittently oscillated thereby stepping the ratchet wheel 101 forward to actuate .the feed rollers.

With the mechanism above described blanks are fed in such close succession that substantially no time need be wasted andthe formation of waste ends or butts is almost entirely eliminated. Fresh blanks may be inserted in a fraction of the time necessar in feed mechanisms of the usual type while the entire structure is of Vsimple form and may readily be attached to existing machines without any substantial alterations in the latter. l

We claim: Y

1. A tack machine comprising movable blank presenting and feeding means including a bodily movable feed roll, blank replenishing devices, and means controlling the replenishing devices, the operation of said controlling means being determined b the position of the bodily movable feed rol 2. A tack machine having blank replenis'hing means including an-'electro-magnetic device, and blank feeding devices comprising a pair of opposed feed rolls, one of said rolls being bodily movable toward and from the' other, an electrical contact kelement movable in consonance with the bodily movement of said roll, and a relatively'xed contact element cooperable` withsaid movable contact element, said elements constituting Aterminals of an electrical circuit including blank replenishing means including an elec` tro-magnetic device, a bodily movable feed roll supported by the presenting means and normally ositioned by engagement with a blank on its way to the cutting instrumentalities, and an electrical circuit comprising normally spaced terminals and including the windings of said electro-magnetic device, one of said terminals being movable with the feed roll, said movable terminal being constructed and arranged to complete the electrical circuit throughv the terminals upon movement .of the feed roll due to substantial exhaustion of the blank in the presenting means.

4. A tack machine comprising blank replenishing` means including an electro-magnetic device, an oscillating barrel, a bodily movable blank feeding roll supported thereby, a relatively fixed electrical contact car# bodily movable feed roll supported thereby,

an electrical contact member movable with said feed roll, yan insulated contact: fixed relatively to the barrel and engageable by the first contact, an insulated ring carried by the barrel electrically connected to the los Y,

fixed contact, and a resilient -finger engaging the ring in all positions of the barrel and constituting an element of an electrical circuit, said circuit including the windings of said electro-magnetic device.

6. A tack machine comprising a blank replenishing mechanism including an electromagnetic device, an oscillating'barrel, a casing secured to one end of the barrel, a feed roll mounted in fixed bearings in the casing, a cooperating feed roll mounted to move bodily toward and from the first roll, a spring tending to move'the second roll toward the first roll, a lever movable in consonance with the bodily movable roll, an electrical contact element carried by the lever, and a cooperating contact-'element supported by the barrel, said contact elements and the windingsof the electro-magnetic device being included in an electrical circuit; l

7. A tack machine comprising a blank presenting barrel, means for inserting a reserve blank into the barrel, a releasable retaining device normally preventing operation onf the inserting means, electro-magnetic means for rendering the retaining device inoperative, a bodily'movable feed roll supported by the barrel, a contact element movable with the feed roll, and a second contact element engageable by the first upon failure of the roll to engage a blank, engagement of said contact elements completing an electrical circuit to energize the electro-magnetic means. j

8. A tack machine having tack forming and blank presenting means, replenishing devices,y a releasable latch for determining operation of the replenishing devices, a bodily movable feed ,roll maintained in a predetermined position by a blank in the ,presenting means, means tending to move the roll away from such position, and means to release the latch, said releasing means responding tot movemenlt of the feed roll from said predetermined position due' to substantial exhaustion of a blank from the preslanting means and thereby releasing the atc 1 9. A tack machine comprising a blank presenting barrel, means for inserting a reserve blank'into the barrel, an electrically releasablek latch normally preventing operation of the blank inserting means, a pair of feed rolls supported by the barrel, one roll being bodily movable relatively to the other, and electrical contact means actuable upon movement of the bodily movable roll toward the other roll in the absence of ablank between them to complete an electrical circuit whereby to release the latch and permit 4insertion lof the reserve blank into the barrel. 10.' A tack machine comprising an oscillating barrel, blank replenishing means,

`means including an electrical circuit, a

bodily movable feed roll supported by the barrel and normally held 'in predetermined position by engagement with a blank, an electrical contact movable with the roll, a second contact fixedly mounted `upon the barrel but insulated therefrom, an insulated ring mounted on the barrel connected with the :fixed contact and a resilient finger bearing upon the ring and connected to one terminal of the circuit, the other terminal thereof being electrically connected to the barrel.

11. A tack machine comprising a blank replenishing mechanism including a latch and a solenoid for releasing it, an oscillating barrel, a pair of shafts supported thereby, each being provided with a feed roll, one shaft being bodily movable relatively to the other, a yoke supported by the movable shaft, a lever bearing upon the yoke, a spring vacting upon the yoke normally tending to urge the bodily movable shaft toward the other shaft, theishafts normally being held apart by the interposition of a blank `between the feed rolls, an electrical contact carried by the lever, and a second contact engageable by the first upon approach of the feed rolls due to absence of a 'blank between them, said contacts and the windings of the solenoid being included in the same electrical circuit.

12. A. tack machine comprising a blank replenishing mechanism including an electro-magnetic device, an oscillating barrel, a casing secured tothe barrel, a pair of shafts journaled in the casing, one shaft being movable bodily toward and from the other and-each being provided with a feed roll, a yoke supported by the bodily movable shaft, a Apin projecting from the top of the yoke, a lever fulcrumed adjacent to one end bearing upon the top of the yoke and having an opening for the reception of the pin, a spring bearing upon the top of the lever, an electrical contact element carried by the free end of the lever, and a cooperating contact carried kby but insulated from'the barrel, saidl contact elements and the windings of the electro-magnetic device forming parts of the same electrical .circuit.

13. A tack machine having an oscillating barrel and blank replenishing means comprising a sliding member provided with a journal opening, a .shaft turning freely in said opening and normally aligned with the axis of the barrel, a fixed jaw carried by the shaft, and a fiat spring cooperable with the fixed jaw to grip the end of a blank.

14. A tack machine having an oscillating barrel and blank replenishing means comprising a member guided to slide toward and from the open end of the barrel and constructed and' arranged to support one end of a blank having itsopposite end supported within the end of the barrel and with its central portion unsupported.

15. A tack machine having an oscillating barrel and blank replenishing means comprising a member movable toward andfrom the end of the barrel, and clam ing means carried by said member arrange resiliently to grip and hold one end of a blank 1n llne with the axis of the barrel, the opposite end of the strip being supported within the barrel, the central portion of the blank beng'unsupported.

16. A tack machine comprising an anvil an oscillating barrel provided at one end with a nose piece normally resting upon the barrel the opposite end of the barrel being supported by a ball and cup bearing, arallel posts disposed upon opposite si es of the barrel intermediate its ends, a cross bar removably secured to the upper ends ofthe posts, a yoke guided for vertical movement by engagement with the posts and having a concave under surface normally bearing upon the barrel, and a compression sprlng interposed betweenthe yoke and cross bar.

17. A tack machine comprising an oscillating barrel, having. a sleeve-like extension at one end, said extension terminating in a box-like casing, a pair of feed rolls mounted on the casing, a lever device pivotally mounted upon the extension, means. for rocking the lever device as the barrel oscillates, and connections between the lever device and feed rolls for turning the latter step by step as the lever is rocked.

18. A tack machine comprising cutting instrumentalities and means for ceding a. blank to the cutting instrumentalities-comprising an oscillating barrel supporting a pair of feed rolls, a ratchet wheel secured to one of the'rolls, a pawl engageable with the ratchet wheel for turning 1t, a lever device pivotally supported by the barrel, a cam carried by the lever device, means connecting the lever device with the pawl, and a relatively fixed abutment arranged in the path of the cam as the latterturns with the barrel whereby to swing the lever device and actuate the pawl.

19. A tack machine comprisin an oscillatin barrel, a pair of feed ro ls carried there y, one of the feed rolls having a' ratchet wheel secured thereto, a pawl for turning the ratchet wheel, a lever device pivotally supportedby the barrel to oscilate about an axis transverse to that of the barrel, a link connecting the lever device with the pawl, a cam mounted at each end of said lever device, and means fixed relatively to the barrel for engagement with the respective cams as the barrel oscillates whereby to actuate the feed rolls.

20. A tack machine having blank feeding means comprising an oscillating barrel, a pair of feed rolls supportedthereon, a ring concentric with the barrel and supported to oscillate about an axis transverse to that of the barrel, a cam mounted upon each face of the ring, means engageable with the respective cams as rocking the ring, and means for transmittirg movement from the ring to the feed ro s.

. 21. A'tack machine comprising an oscillating barrel provided at one end with an extension comprising a sleeve terminating in a casing, a pair of feed rolls journaled in the casing, a ratchet wheel fixed to one roll, a pawl cooperable with the ratchet wheel, a ring surrounding the sleeve, diathe barrel oscillates for 1 metricallyopposed pivot members connectconcentric with the barrel, diametrically opposed pivot members supporting the rin to rock about an axis transverse to that o the barrel, a cam secured to either face of the ring, the cams being substantially diametrically opposite one another, spaced elements engageable with the respective cams as the barrel oscillates whereby to -rock the ring, and 'connections between the ring andY feed rolls for actuating the latter.

23. A tack lmachine comprising an oscillating barrel having a sleeve adjacent to one of the ends, said sleeve having a peripheral rib provided at diametrically opposite points wit socket o enings, a ring concentric with the sleeve, ,ra ially arranged pivot pins prolec'ting from the inner periphery of the rin lnto the respective socket openings, a pair o feed rolls supported by the sleeve, means for rocking the ring about the axis defined by the pivot pins Vas the barrel oscillates, and means transmitting movement from the ring to the feed rolls.

2,4. A tack machine having blank feeding means comprlsing` an oscillating barrel, a palr of feed rolls supported thereby, a lever device carried by the barrel arranged to rock ing entrance and exit openin s aligned with the axis of the-barrel, and evices projecting from opposite sides of the casing intol lating) barrel, a pair of feed rolls supported there anda pair of oppositely directed pins arranged in advance of the feed rolls, said pins having beveled ends providing a Haring guideway for centering a blank in approachingthe rolls.

27. A tack machine comprising an oscillating barrel and a pair of feed rolls supported thereby, each roll consisting of a plurality of axially spaced members having knurled peripheral surfaces'.

- 28. A tack machine having an oscillating barrel provided with a nose piece, vthe latter comprising upper and lower spaced plates providin a guide passage therebetween, a pairof` eed rolls supported by the barrel,

each roll consisting of a plurality of spaced members, and guide tongues projecting from the ends of the respective plates and extending into the'spaces between the members composing each roll.

29. A tack machine having an oscillating barrel provided with a nose piece comprising upper and lower spaced plates providing a guide passage between them, a pair of feed rolls supported by the barrel, the feed rolls each having a peripheral groove, and a guide ,tongue forming an integral continuation of each plate, the guide tonguesy of the two plates extend-ing into the grooves of the respective rolls.

30.`A tack machine having an oscillating barrel provided with a nose piece, the nose piece comprising upper and lower substantially parallel elongate plates and apair of spacer members removably secured between the plates and spaced from each other'to provide a guide passage extending longitudinally of the nose piece.

31. Mechanism of the class described having a blank receiving barrelprovided with a nose piece, the nose piece comprising a bottom (plate, a top plate, spacer means interpose between the plates, and means for removably retaining the plates and spacer means in assembled relation.

32. Mechanism of the class described having a barrel provided with a blank presenting nose piece, the nose piece mnprising upper. and lower members and interchangeable spacer elements interposable between said members to provide a variable blank guiding passage to accommodate blanks of diii'erent cross sectional area.

Si ed by us at Brockton, Mass., this second ay of August .1923.

GEORGE B. BAKER. HERBERT B. BAKER. EDWARD C. BAKER. 

